The shirt fits snugly which took a little getting used to. It is really nice to have the rear pockets, sun protection on my arms, and cooling effect, though. This shirt cools much better than I expected. On my first run, an 85' F day, I was even a little cool during a breezy section going over a bridge. I've worn it in the water, and amazingly it stays put and stays snug. I can't wait to use it on race day.